Continuous output
Continuous output kW 15 22 33
For DHW heating from 10 to 45 °C and a heating water flow temperature of 70 °C at the heating
water flow rate stated below (tested at HV
1
/HR
1
)
l/h 368 540 810
Heating water flow rate for the stated continuous outputs l/h 252 378 610
For DHW heating from 10 to 60 °C and a heating water flow temperature of 70 °C at the heating
water flow rate stated below (tested at HV
1
/HR
1
)
l/h 258 378 567
Heating water flow rate for the stated continuous outputs l/h 281 457 836
Information regarding continuous output
When engineering systems with the specified or calculated continu-
ous output, factor in a matching circulation pump. The stated contin-
uous output is achieved only if rated boiler heating output is ≥ contin-
uous output.
Performance factor N
L
■ To DIN 4708
■ Cylinder storage temperature T
cyl
= cold water inlet temperature
+50 K
+5 K/-0 K
and 70 °C heating water flow temperature
Performance factor N
L
subject to the heating output delivered by the boiler (Q
D
)
Cylinder capacity l 750 950
Q
D
in kW N
L
performance factor
15 2.00 3.00
18 2.25 3.20
22 2.50 3.50
27 2.75 4.00
33 3.00 4.60
Information regarding performance factor
The performance factor N
L
depends on the cylinder storage temper-
ature T
cyl
.
Standard values
■ T
cyl
= 60 °C → 1.0 × N
L
■ T
cyl
= 55 °C → 0.75 × N
L
■ T
cyl
= 50 °C → 0.55 × N
L
■ T
cyl
= 45 °C → 0.3 × N
L
Peak output (over 10 minutes)
■ Relative to performance factor N
L
■ DHW heating from 10 to 45 °C and 70 °C heating water flow tem-
perature
Peak output (l/10 min) subject to the heating output delivered by the boiler (Q
D
)
Cylinder capacity l 750 950
Q
D
in kW Peak output
15 190 230
18 200 236
22 210 246
27 220 262
33 230 280
Max. draw-off rate (over 10 minutes)
■ Relative to performance factor N
L
■ With reheating
■ DHW heating from 10 to 45 °C and 70 °C heating water flow tem-
perature
Max. draw-off rate (l/min) subject to the heating output delivered by the boiler (Q
D
)
Cylinder capacity l 750 950
Q
D
in kW Max. draw-off rate
15 19.0 23.0
18 20.0 23.6
22 21.0 24.6
27 22.0 26.2
33 23.0 28.0
DHW cylinders
(cont.)
68
VIESMANN
VITOSOL
7
5822 440 GB
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